Update date-fns and date-fns-tz to v3

src/components/thumbnail.ts

@@ -1,4 +1,4 @@
-import format from 'date-fns/format';
+import { format } from 'date-fns';
 import {
   CSSResult,
   html,

src/components/timeline-core.ts

@@ -1,6 +1,4 @@
-import add from 'date-fns/add';
-import differenceInSeconds from 'date-fns/differenceInSeconds';
-import sub from 'date-fns/sub';
+import { add, differenceInSeconds, sub } from 'date-fns';
 import {
   CSSResultGroup,
   html,